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Precision sensing of AC magnetic fields from moving platforms
Author(s): Mark W. Roberson; Abigail E. Bell; Steve Waller; Laura E. Roberson; Grant D. Robertson; Russell G. Robertson
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Paper Abstract

Mapping alternating current (AC) magnetic field strengths over time by mapping of the field strengths presents detailed information of human activities and the presence of facilities. Unlike few fixed location viewing, with a moving detector measurement accuracy becomes more challenging. The use of real-time geospatial analytics requires several changes in detection methodologies and data dissemination. For small unmanned airborne systems (sUAS), ensuring the rotational stability of the sensor while reducing the self-sensing noise presents design challenges in the airframe. For ground vehicles, the rapidly changing values of the AC magnetic fields require rapid and accurate updates of the position. This information must be precisely indexed to magnetic field strength frequency and phase information. We discuss our work with the collection of multi-axis magnetic field data from both multi-rotor sUAS and ground vehicles. We model the power lines using detailed measurements of the conductors and field modeling software. We study the sUAS magnetic field data as a function of height above the ground plane of the experimental sites for both the fundamental and harmonic frequencies and phases relative to a fixed location reference time signal. The collection regions include rural, interstate, and suburban areas with both overhead and buried power lines contributing to the signals.

Paper Details

Date Published: 13 May 2019
PDF: 12 pages
Proc. SPIE 10992, Geospatial Informatics IX, 109920I (13 May 2019); doi: 10.1117/12.2519247
Show Author Affiliations
Mark W. Roberson, Goldfinch Sensor Technologies and Analytics LLC (United States)
Abigail E. Bell, Goldfinch Sensor Technologies and Analytics LLC (United States)
Steve Waller, Goldfinch Sensor Technologies and Analytics LLC (United States)
Laura E. Roberson, Goldfinch Sensor Technologies and Analytics LLC (United States)
Grant D. Robertson, Goldfinch Sensor Technologies and Analytics LLC (United States)
Russell G. Robertson, Goldfinch Sensor Technologies and Analytics LLC (United States)


Published in SPIE Proceedings Vol. 10992:
Geospatial Informatics IX
Kannappan Palaniappan; Peter J. Doucette; Gunasekaran Seetharaman, Editor(s)

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